| Budget Amount *help |
¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2014: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
Fiscal Year 2012: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
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| Outline of Final Research Achievements |
Dissolved organic matter (DOM) in the ocean constitutes one of the largest reduced carbon pools in the global carbon cycle. Bio-refractory components of DOM (RDOM) are major fraction of DOM, however, the sources/production mechanisms of RDOM have not been clarified. Recently, importance of microbial RDOM production has been pointed out, and this process has been defined as the microbial carbon pump (MCP). However, the mechanism of MCP has not been well documented.
In this study, we focused humic-like substances in DOM as a MCP product. We determined spatial distribution of humic-like substances in the open ocean and found that humic-like substances are possibly accumulated in the deep ocean. In addition, we established the microbial incubation technique for evaluating microbial RDOM production. The technique would be useful for quantitative evaluation of MCP.
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